#define _CRT_SECURE_NO_WARNINGS 
#include<stdio.h>
int main()
{
    int n = 0;
    int count = 0;
    scanf("%d", &n);
    int i = 0;
    for (i = 0; i < 32; i++)
    {
        if (((n >> i) & 1) == 1)
            count++;
    }
    printf("%d", count);

    return 0;
}